I see this,
if you are seeing less than that or expecting more you probably need to update your graphic card, which you call ?. We ask these profile questions for a reason.
Try to fill them in.
To test if your graphic card is causing problems go to Window?Preferences/OpenGl and turn off Use fast feedback.
If this fixes your issue it is a sure sign you need to update your graphic card driver.

By the way,having a quick look it would appear you have imported this from cad with all its layers and blocks. They don’t work correctly in SU. There are many threads about the best way to import cad files. Most importantly you should understand that layers in SU are not like layers in Cad.
Have a read here for an example.https://help.sketchup.com/en/sketchup/controlling-visibility-layers